Separating membrane and related secondary battery and electric device

CN119698712APending Publication Date: 2025-03-25CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202380060583.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-04-10
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

During the charging and discharging process of existing secondary batteries, metal dendrites easily penetrate the isolation film, causing the positive and negative electrodes to be short-circuited, reducing the reliability of the battery.

Method used

An isolation membrane composed of a first porous base film, a second porous base film and a coating is used. The coating contains particles such as molybdenum disulfide, silicon oxide or transition metal oxide, which reduces dendrite puncture through redox reactions. risk and improve the heat resistance of the isolation film.

Benefits of technology

It effectively isolates the positive electrode piece and the negative electrode piece, reduces the risk of dendrite puncture, improves the reliability and energy density of secondary batteries, and improves the heat resistance of the isolation film.

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Abstract

The embodiment of the invention provides an isolating membrane, a preparation method thereof, a related secondary battery and an electric device. The isolating membrane comprises a first porous base membrane, a second porous base membrane and a coating, the coating is arranged between the first porous base membrane and the second porous base membrane, the coating comprises first particles, and the first particles comprise at least one of molybdenum disulfide, silicon oxide, transition metal oxide or conductive carbon particles.
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